Collapsible-loop antenna for radio apparatus



July 16, 1929. H. E. BLAESDELL COLLAPSIBLE LOOP ANTENNA FOR RADIO APPARATUS Filed Sept. 5, 1924 f77/Z/677/ 2507"" Her/barf Z". 15/0/60 6.

Patented July 16, 1929.

UNITED STATES 1,721,1e1 NT oFFicE.

PATE

HERBERT n. BLAISDELL, or BOSTON, MASSACHUSETTS, AssIonon mo WILLIAM J.

SANIDBERG, or CHICAGO, ILLINOIS.

COLLAPSIBLE-LOOP ANTENNA FOR RADIO APPARATUS.

Application filed September 3,1924. Serial No; 735,568.

its object to provide a loop antenna and support therefor, capable of being collapsed and folded into a small'space for shipment or for packing.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims.

Referring to the drawings Figure 1 represents a front elevation of a loop antenna embodying my invention. the device being illustrated in the position it assumes when assembled and ready for use.

Fig. 2 is a detail side elevation of portion of the device illustrating the manner of clamping the antenna wire to the cross bars.

Fig. 3 is a detail sectional elevation illustrating one of the T-shaped brackets and the adjacent portions of the standard members and arms, which comprise the support for the antenna.

Fig. 4 is a view illustrating the device in a collapsed position, the antenna wire being omitted.

Like numerals refer to like parts through out the several views of the drawings.

In the drawings, 5 represents a standard which embodies therein a top member 6, a central member 7 and a bottom member 8, the latter being provided at its lower end with a cylindrical portion 9 which is adapted to fit a socket 10 mounted upon a base 11,

' thereby enabling said standard to be rotated within said socket. The members 6,7 and 8 of the standard 5 are preferably rectangular in. cross section and are located in longitudinal alignment with each other, their adjacent ends abutting together when the device is in its extended position and being located within a pair of T-shaped brackets 12.

The brackets 12 embody therein a main portion 13 which is slidably mounted upon the members of the standard 5, and when the device is in its extended position as illustrated in Fig. 1, the adjacent abutting ends of said members are located about midway of said main portion 13 of said bracket, as illustrated in Fig. 3. Each bracket 12 also embodies therein two pairs of parallel fingers 14 projecting from opposite sides thereof and between each pair of flanges an arm 15 is pivotally mounted at 16. Each arm 15 has a groove 17 provided in the outer end thereof, while the member 6 of the standard 5 has a groove 18 provided in the top end thereof, and the bottom member 8 of the standard 5 has a hole 19 extending transversely therethrough.

Secured in any suitable manner in each of the grooves 17 and 18 and in the hole 19 are cross bars 20, the latter extending an equal distance upon each Side of the arms 15 and the standard 5, and supported upon said cross bars is a loop antenna 21 which consists of a suitable 'wire which is wound around the support extending over the cross bars 20,and preferably making a. plurality of continuous turns around said support and forming a six sided polygon, the latter preferably having parallel vertical sides and tapering upper and lower end portions. The wire comprising the antenna 21 is held spaced apart a'suitable distance upon the cross bars by a clamping bar 22 which is secured to the cross bars 20 by screws 23. The inner extremity of each of the arms 15 is flattened at 24 in such a manner that it will engage the adjacent surface of the bracket 12 when said arms reach a horizontal position and said flat portion 24, therefore, forms a stop to limit the extent to which said arms may be extended when the device is in its open position.

device, the central member 7 of the standard 5 is withdrawn from the brackets 12, the upper bracket being pushed upwardly upon the member 6 and the lower bracket being pushed downwardly upon the member 8. At the same time the arms 15 are folded inwardly in the direction of the arrows Fig. 1, until they are located in a position against the brackets 12, as illustrated in Fig. 4.

As the central member 7 of the standard 5 is now disengaged from each of the brackets 12, the upper and lower folded portions of the device, with the antenna 21 Still in clamped position thereon, may be laid one upon the other and the lower portion 8 of the standard 5 is removed from the socket 10.

This allows all of the portions of the device to be packed in avery small receptacle, while at the same time the various parts are all secured together in such a way that they may be instantly reassembled when it is again desired to use the device. By constructing the loop in the particular polygonal shape illustrated, it is possible to utilize the required length of Wire and at the same time provide a comparatively narrow loop and one which may be retated in a very narrow space.

I claim:

1. A device of the character described comprising, in combination, a standard, a plurality ol brackets slidably mounted upon said standard, arms pivotally mounted upon opposite sides of each bracket, cross arms on the freeends of said arms and standard, a loop antenna secured to said cross arms, and the outer ends of said arms being free of connect-ions other than the antenna wires.

2. A device of the character described com prising, in combination, a standard embodying therein a plurality of longitudinally abutting members, brackets slidably mounted upon said members and adapted to position the latter in alignment with each other, arms pivotally mounted upon said brackets, and a loop antenna supported upon said arms and standard.

3. A device of the character described coml'irising, in combination, a standard embody ing therein a plurality of longitudinally abutting members, a plurality of T-shaped brackets slidably mounted upon said members and adapted to position the latter in alignment with each other, said members being provided with flanges projecting "from the opposite sides thereof, arms pivotally mounted between said flanges and a loop antenna supported upon said arms and standard.

4. A device of the character described C0111- prising, in combination, a standard embodying therein top and bottom members and a central member spacing said top and bottom members apart, brackets slidably mounted upon said members and positioning the latter in alignment with each other, arms pivotally mounted upon said brackets, and embodying therein means to position said arms relatively to said standard, and a loop antenna supported upon said arms and standard.

V 5. A device of the character described comprising, in combination, a standard embodying therein a plurality of loosely abutting members, brackets slidably mounted upon said members and normally holding the latter in longitudinal alignment with each other, arms pivotally mounted upon said bracketsand embodying therein D'IQELIIS to position said arms relatively to said standard, and a loop antenna supported upon said cross bars.

6. Ina device of the character described, a standard embodying a plurality of pieces adapted to be arranged in end to end abutting relation when the device is extended for use, a' bracket slidingly mounted on the standard, and adapted to overlap the abutting ends of two of said pieces to hold them in alignment when the device is extended, arms pivotally mounted on opposite sides of the bracket, and a loop antenna supported by the standard and arms.

7. In a device of the character described, a standard embodying aCplurality of pieces adapted to be arranged in end to end abutting relation when the device is extended for use, a bracket slidingly mounted on the standard, and adapted to overlap the abutting ends of two of said pieces tohold themin alignment when the device is extended, arms pivotally mounted on opposite sides of the bracket. flanges extending out from opposite sides of the bracket, arms pivotally mounted on said flanges to swing in to collapsed position and out to operative position, and

stop means for retaining the arms at substantially right angles to the standard when they are swung out to operative position.

8. In a device of the character described, a standard. embodying a plurality of pieces adapted to be ananged in end to end abutting relation when the device is extended for use, a bracket slidingly mounted onthe standard, and adapted to overlap the abutting ends of two of said pieces to hold them in alignmentwhen the device is extended, arms pivotally mounted on opposite sides of the bracket, flanges extending out from opposite sides of the bracket upon which the arms are pivotally mounted to swing inand out, the inner ends of the arms formed to act as stops to retain the arms at substantially right angles to the standard when swung out to operative position, and a loop antenna supported by the arms and stand ard. Y

In testimony whereof I have hereunto set my hand.

HERBERT E. BLAISDELL. 

